Tứ diện (Tetrahedron) – FreeCAD

A tetrahedron solid created in FreeCAD.

A platonic solid is a body where all the faces are identical in shape and size, with identical edges and angles, and the same number of faces meet at each vertex. There are only 5 platonic solids in 3 dimensional space:

1. Tetrahedron (4 faces)
2. Cube (6 faces)
3. Octohedron (8 faces)
4. Dodecahedron (12 faces)
5. Icosahedron (20 faces)

The tetrahedron is the platonic solid with the fewest number of faces. Platonic solid shapes are often used for dice due to their symmetry and regularity, giving each face an equal chance of landing facing upwards when rolled.

Credit to Ray Fox for being the first to upload a public domain tetrahedron to Printables.